Finding the Value of Function Arguments

#include "pin.H"
#include <iostream>
#include <fstream>

/* ===================================================================== */
/* Names of malloc and free */
/* ===================================================================== */
#if defined(TARGET_MAC)
#define MALLOC "_malloc"
#define FREE "_free"
#else
#define MALLOC "malloc"
#define FREE "free"
#endif

/* ===================================================================== */
/* Global Variables */
/* ===================================================================== */

std::ofstream TraceFile;

/* ===================================================================== */
/* Commandline Switches */
/* ===================================================================== */

KNOB<string> KnobOutputFile(KNOB_MODE_WRITEONCE, "pintool",
    "o", "malloctrace.out", "specify trace file name");

/* ===================================================================== */


/* ===================================================================== */
/* Analysis routines                                                     */
/* ===================================================================== */
 
VOID Arg1Before(CHAR * name, ADDRINT size)
{
    TraceFile << name << "(" << size << ")" << endl;
}

VOID MallocAfter(ADDRINT ret)
{
    TraceFile << "  returns " << ret << endl;
}


/* ===================================================================== */
/* Instrumentation routines                                              */
/* ===================================================================== */
   
VOID Image(IMG img, VOID *v)
{
    // Instrument the malloc() and free() functions.  Print the input argument
    // of each malloc() or free(), and the return value of malloc().
    //
    //  Find the malloc() function.
    RTN mallocRtn = RTN_FindByName(img, MALLOC);
    if (RTN_Valid(mallocRtn))
    {
        RTN_Open(mallocRtn);

        // Instrument malloc() to print the input argument value and the return value.
        RTN_InsertCall(mallocRtn, IPOINT_BEFORE, (AFUNPTR)Arg1Before,
                       IARG_ADDRINT, MALLOC,
                       IARG_FUNCARG_ENTRYPOINT_VALUE, 0,
                       IARG_END);
        RTN_InsertCall(mallocRtn, IPOINT_AFTER, (AFUNPTR)MallocAfter,
                       IARG_FUNCRET_EXITPOINT_VALUE, IARG_END);

        RTN_Close(mallocRtn);
    }

    // Find the free() function.
    RTN freeRtn = RTN_FindByName(img, FREE);
    if (RTN_Valid(freeRtn))
    {
        RTN_Open(freeRtn);
        // Instrument free() to print the input argument value.
        RTN_InsertCall(freeRtn, IPOINT_BEFORE, (AFUNPTR)Arg1Before,
                       IARG_ADDRINT, FREE,
                       IARG_FUNCARG_ENTRYPOINT_VALUE, 0,
                       IARG_END);
        RTN_Close(freeRtn);
    }
}

/* ===================================================================== */

VOID Fini(INT32 code, VOID *v)
{
    TraceFile.close();
}

/* ===================================================================== */
/* Print Help Message                                                    */
/* ===================================================================== */
   
INT32 Usage()
{
    cerr << "This tool produces a trace of calls to malloc." << endl;
    cerr << endl << KNOB_BASE::StringKnobSummary() << endl;
    return -1;
}

/* ===================================================================== */
/* Main                                                                  */
/* ===================================================================== */

int main(int argc, char *argv[])
{
    // Initialize pin & symbol manager
    PIN_InitSymbols();
    if( PIN_Init(argc,argv) )
    {
        return Usage();
    }
    
    // Write to a file since cout and cerr maybe closed by the application
    TraceFile.open(KnobOutputFile.Value().c_str());
    TraceFile << hex;
    TraceFile.setf(ios::showbase);
    
    // Register Image to be called to instrument functions.
    IMG_AddInstrumentFunction(Image, 0);
    PIN_AddFiniFunction(Fini, 0);

    // Never returns
    PIN_StartProgram();
    
    return 0;
}

/* ===================================================================== */
/* eof */
/* ===================================================================== */

RTN_FindByName(img,MALLOC)을 사용해서 malloc이 사용된 부분을 찾는다! 

malloc이 사용될 때는 IARG_FUNCARG_ENTRYPOINT_VALUE로 malloc의 인자를 찾고,

IARG_FUNCRET_EXITPOINT_VALUE을 통해 malloc으로 리턴된 값을 찾는다.

RTN_FindByName(img,FREE)을 사용해서 free가 사용된 부분을 찾는다!

IARG_FUNCARG_ENTRYPOINT_VALUE로 free의 인자를 찾는다.